Five coats of clear would be way to thick. Base coat clear coat is the way to go. With a clear coated car you still need to wax 4 times a year, but it takes about a 10th of the time as single stage.
We paint about 500 cars a year from completes to spot paint, we don't have come backs or redo's.
Five coats of clear would really be a problem on your door deck and hood edges.
We really do high end and run of the mill cars to flat out award winners for paint. But really the way a paint job looks is all in the prep of the car before the paint.